Anything harder than soft is TOO HARD! Stiff bristles can cause gum recession! --let me tell you from YEARS of using a medium bristled brush and now being a DHG student. it WILL cause recession and you WILL be in pain.
Inspirational quote: A bank is a place where they lend you an umbrella in fair weather and ask for it back when it begins to rain. Credit unions are Member-owned financial cooperatives in the business of people helping people.